Interpole for rotary converters



Aug. 25, 1931. E. SAUTER 0,

INTERPOLE FOR ROTARY CONVERTERS Filed Aug, 9', 1926 Z25 ll lll hue/75f: 2721/02 501213 2; I

of pole pieces for supporting windings'in 'plicability to construction of Patented Aug. 25, 1931 um'r ao PATENT mm 'ERWIN SAUTER, or BADEN, SWITZERLAND, ASSIGNOR T0 'AKTIENGESELLSCHAF'T.

BROWN BOVERI & CIE, OF BADEN, SWITZERLAND, A JOINT-STOCK COMPANY OF 7 i i SWITZERLAND I T'EBPOLE' non no-ran? CONVERTERS This invention relates to the construction electrical machines, and has particular-apthe interpoles of rotary converters. I i i y A- general object of the invention is the provision of construction for' pole pieces which facilitates assembly of-the apparatus and a variation, as desired, of theeite'ctiveness of the pole as an inductive factor inthe machine, whereby a standard design :of pole piece may be utilized in machines differing in their electriCal Characteristics.

A specific object of theinvention is the provision of a construction whereby a standard design of polepiece is adaptable to different machines requiring different magnetic densities in the poles, or different air gap clearances or different sizes of pole wind- 6 ings.

A further object is the. provision of a construction whereby removal of pole windings may be accomplished without dismounting the pole pieces.

A further object is the provision of a pole piececonstruction which will permit adjustment of the air gap after the pole structure and the, rotor have been assembled in the frame.

Other and further objects of the invention will be pointed out or indicated hereinafter, or will be obvious to one skilled in the art 1 upon an understanding of the invention.

In the accompanying drawings forming a part of this specification, I show one embodiment of the invention, but it is to be understood that'this is presented for illusnating current machine showing two of the main poles and one interpole, the latter being of a construction embodying the invenassembled pole tion;

Fig. 2 is a side elevational view of an piece embodying the invention;

Fig. is an end View of the same, showing its relationship with themachine frame; and

1 Fig.4 is a top view of a spacing member,"

in reduced scale. c p

Inthe construction of poles for dynamoelectric' machines, and particularly in the construction of commutating poles or inter.- poles' for such machines, the amount of effectivemagnetic iron, density of the mag netic field, and theiair gap clearance are important factors in determining the eflectiveness of the poles in the functioning ofv the machine. Particularly in the case of commutatingpoles or interpoles, must the construction be such as to maintain the effectivenessof the pole within quite definite" variation: of jfeatures contributing to thepoles effectiveness among'different machines of'the same size but designed for different conditions ofop'erationp Y o -2The nature of the invention will be readily understood by reference to the illustrative embodiment shown in the drawings,

wherein thej numeral l0 designates a portion of the niachine' frame upon 'which' are mounted the main poles 11 and an interpole 12., The latter comprises a suitable winding supported on a pole-piece whichis mounted onthe frame. The pole piece comprises a core member 14 which is a rectangular piece of magnetizable iron having its lateral cor fners bevelled at 146}. To its opposite sides 16, and terminating flush with the upper surface of the-core member. At the lower,

or inner end; of the core member is the supplementary plate 17 also of magnetizable .imetal similar'to that of the core member, Said pl'ateconforms-in outline to the lateral are applied the pole plates 15, also of mag- I netizable iron, the same being held assembled on the core member by the rivets contour of the core member 14 and constitutes in effect an extension of the same. There may be a plurality of these supplemental plates thus assembled to extend the core member 1 1 inwardly. They, together with the distance pieces 19 and 20 and the pole shoe 21, are held in position on the core member by the screws 18, which are of nonmagnctizable metal, such as brass. The pole shoe 21 conforms in contour to the cross sectional shape of the core member 14, and like it is of magnetizable material. The distance pieces 19 and 20 are of brass or other non-magnetizable material, and are in the form of washers, through which the screws 18 pass. The heads of the: screws: 18 are counter-sunk in the pole shoe 21 and the screws are threaded into the core member 14 so that when set up, the supplementary plates 17 are clamped: against the end of the core member 1st, and the distance pieces 19 and 20 are clamped between the pole shoe and the supplementary plate. To the bottom or inner face of the pole shoe 21, a brass coilaetaining plate 22 is secured by the brass screws 24. By virtue of this construction the iron in the pole piece is interrupted by air gap, the width of which may be varied to suit the particular installation, by

addition or subtraction of one or more of the distan 'e pieces 19 or 20. The length of the pole piece may likewise be lengthened or shortened by addition or subtraction of. the supplementary plates 17 At its upper end, the core member 14 is, tapped at 25 to receive a bolt 26,. whereby the pole. is mounted in the machine frame. A. plurality of. thin shims or spacers 27 is provided, the same beingmade of magnetizable material, and being slot-ted at 27 so that. they may be driven in to straddle the. bolt between the frame and the pole member. In this manner the distance towhich the pole; will. can tend inwardly from the. frame may be T8.- ried. An outer coil-retaining plate 28, having an aperture to. receive the core member 141, abuts the lower margins of the pole plates 15, and the pole winding 29 is-rfitted on tothe core member 14 and the shoe 21 between the plates 22' and Q8.

Thus it will be seen, the invention provides a construction wherein the amount, of iron in the pole may be varied, the air gap within the pole may be varied, and the air gap between the plate 22 and the rotor may be varied, or may be maintained at a desired clearance with variation in the other features mentioned, through provision of the spacers 27. Accordingly, pole pieces of this design are adapt-able to a wide variety of particular instances of machine construe.- tion. The windings may beremoved, afiter the rotor is withdrawn, simply by backing out the screws. 2.4, orthe pole may be Withdrawn as an entity by backing out the bolt 26.

What I claim is:

In a dynamo electric machine, an annular frame, a pole core including a body portion carried by said frame and extending radially inwardly with respect thereto, a winding disposed on. said core, a shoe forming part of said core and disposed at the inner end of said body portion in spaced relation with respect thereto to provide an air gap in said core, spacing means interposed between said body portion and said shoe, a screw extending through said shoe and said spacing means and being screwed into said body portion to clamp said spacing means between the latter and said shoe, plate disposed against the inner face of said shoe and extending laterally beyond the same, laterally-extending, portion of said plate providing against inward movement of said winding out of assembled relation with. respect to said core, and means holding said platein position against the inner face 01 said shoe.

In testimony whereof I have hereunto subscribed my name this 22nd day of July A. D. 1926, at Zurich, Switzerland.

ERWVIN SAUTER. 

